You will have problems spraying model paints at those air pressures. It is far too high so the pressure regulator needs adjusting down to a working pressure.Of course, the pressure regulator controls what pressure comes out the tank not what goes in it but sooner or later the pressure in the tank will drop enough to start the compressor,the 186s runs up the tank to 57 psi and kicks back in when the pressure drops to 50 psi ,the sparmax runs up to 60 and kicks back in at 40,on that basis i would guess the sparmax would restart less frequently than the 186s.
I set mine at 15psi, suitable for MRP lacquers, I would recommend a max of 25psi for most other non-lacquer paints.
Depending on your set up you may need a higher pressure but not much higher.
Spraying at too high pressure will cause spidering, possibly tip-dry with some types of paint and you will also be using up a lot of paint very quickly. The paint may also be dry when it hits the plastic giving a pebble like feel.